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QwtData
Langue: en
Version: 162240 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- SYNOPSIS
- Detailed Description
- Constructor & Destructor Documentation
- Member Function Documentation
- virtual QwtData* QwtData::copy () const [pure virtual]
- virtual size_t QwtData::size () const [pure virtual]
- virtual double QwtData::x (size_t i) const [pure virtual]
- virtual double QwtData::y (size_t i) const [pure virtual]
- QwtDoubleRect QwtData::boundingRect () const [virtual]
- QwtData& QwtData::operator= (const QwtData &) [protected]
- Author
NAME
QwtData -SYNOPSIS
Inherited by QwtArrayData, QwtCPointerData, and QwtPolygonFData.
Detailed Description
QwtData defines an interface to any type of curve data.
Classes, derived from QwtData may:
- •
- store the data in almost any type of container
- •
- calculate the data on the fly instead of storing it
Definition at line 47 of file qwt_data.h.
Public Member Functions
QwtData ()
virtual ~QwtData ()
virtual QwtData * copy () const=0
virtual size_t size () const=0
virtual double x (size_t i) const=0
virtual double y (size_t i) const=0
virtual QwtDoubleRect boundingRect () const
Protected Member Functions
QwtData & operator= (const QwtData &)
Constructor & Destructor Documentation
QwtData::QwtData ()
Constructor.
Definition at line 14 of file qwt_data.cpp.
QwtData::~QwtData () [virtual]
Destructor.
Definition at line 19 of file qwt_data.cpp.
Member Function Documentation
virtual QwtData* QwtData::copy () const [pure virtual]
Returns:
- Pointer to a copy (virtual copy constructor)
Implemented in QwtPolygonFData, QwtArrayData, and QwtCPointerData.
Referenced by QwtPlotCurve::setData().
virtual size_t QwtData::size () const [pure virtual]
Returns:
- Size of the data set
Implemented in QwtPolygonFData, QwtArrayData, and QwtCPointerData.
Referenced by boundingRect(), and QwtPlotCurve::dataSize().
virtual double QwtData::x (size_t i) const [pure virtual]
Return the x value of data point i
Parameters:
- i Index
Returns:
- x X value of data point i
Implemented in QwtPolygonFData, QwtArrayData, and QwtCPointerData.
Referenced by boundingRect(), and QwtPlotCurve::x().
virtual double QwtData::y (size_t i) const [pure virtual]
Return the y value of data point i
Parameters:
- i Index
Returns:
- y Y value of data point i
Implemented in QwtPolygonFData, QwtArrayData, and QwtCPointerData.
Referenced by boundingRect(), and QwtPlotCurve::y().
QwtDoubleRect QwtData::boundingRect () const [virtual]
Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false
Warning:
- This is an slow implementation iterating over all points. It is intended to be overloaded by derived classes. In case of auto scaling boundingRect() is called for every replot, so it might be worth to implement a cache, or use x(0), x(size() - 1) for ordered data ...
Reimplemented in QwtArrayData, and QwtCPointerData.
Definition at line 34 of file qwt_data.cpp.
References size(), x(), and y().
Referenced by QwtPlotCurve::boundingRect().
QwtData& QwtData::operator= (const QwtData &) [protected]
Assignment operator (virtualized)
Author
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